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Initial Setting
Select AC97 Interface, Version 2.0, TX DMA
(AC97S=1,VS=1,TXDMA_EN=1)
Reset AC97 CODEC
(Warm reset or cold reset)
Start Transfer
(ST=1,CRE=1,
TXEN=1,RXEN=1)
Check CODEC Ready
(Read ATAGR)
CR=1?
N
Y
Normal Operation
Write Command or Read
Status
Write Power Down Command
if all data has been transfer
CPU DMA Setting
Figure 14.9 AC97 DMA Program Flow
Содержание HD64465
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